Process for the preparation of an electropyrotechnic initiator by use of an aqueous adhesive
원문보기
IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0301567
(2002-11-22)
|
우선권정보 |
FR-2001-116218 (2001-12-14) |
발명자
/ 주소 |
- Duguet, Jean-René
- Pillaert, Jé
- rô
- me
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
5 |
초록
▼
An electropyrotechnic initiator comprising a pyrotechnic varnish in contact with a resistive heating element is prepared by preparing an aqueous adhesive composed of a dispersion of an explosive substance and of additives in an aqueous suspension based on a copolymer chosen from ethylene/vinyl aceta
An electropyrotechnic initiator comprising a pyrotechnic varnish in contact with a resistive heating element is prepared by preparing an aqueous adhesive composed of a dispersion of an explosive substance and of additives in an aqueous suspension based on a copolymer chosen from ethylene/vinyl acetate copolymers and vinyl acetate/ethylene acetate/ethylene copolymers, depositing the aqueous adhesive on the resistive element, and drying the aqueous adhesive at a temperature of between 55° C. and 75° C., in order to remove the water contained in the adhesive and to obtain the varnish.
대표청구항
▼
1. Process for the preparation of an electropyrotechnic initiator comprising a pyrotechnic varnish in contact with a resistive heating element, comprising:preparing an aqueous adhesive composed of a dispersion of an explosive substance and of additives in an aqueous suspension based on a copolymer c
1. Process for the preparation of an electropyrotechnic initiator comprising a pyrotechnic varnish in contact with a resistive heating element, comprising:preparing an aqueous adhesive composed of a dispersion of an explosive substance and of additives in an aqueous suspension based on a copolymer chosen from ethylene/vinyl acetate copolymers and vinyl acetate/ethylene acetate/ethylene copolymers;depositing said aqueous adhesive on the resistive element; anddrying the said aqueous adhesive at a temperature of between 55° C. and 75° C. in order to remove the water contained in the adhesive and to obtain the varnish. 2. Process according to claim 1, characterized in that the drying of the aqueous adhesive is carried out by infrared radiation. 3. Process according to claim 1, characterized in that the aqueous adhesive is deposited in the liquid state on the resistive element in the form of a calibrated drop using a varnishing device comprising an air-operated metering device. 4. Process according to claim 1, characterized in that the explosive substance is chosen from the group consisting of primary explosives and oxidizer-reducer mixtures. 5. Process according to claim 4, characterized in that the primary explosive is a dinitrobenzofuroxan salt. 6. Process according to claim 5, characterized in that the primary explosive is potassium dinitrobenzofuroxane. 7. Process according to claim 4, characterized in that the explosive substances is a mixture of zirconium and of potassium perchlorate. 8. Process according to claim 1, characterized in that the water content of the aqueous adhesive before drying is between 55 and 70% by weight with respect to the weight of the aqueous adhesive. 9. Process according to claim 1, characterized in that the content of explosive substance in the pyrotechnic varnish after drying is between 65 and 95% by weight with respect to the total weight of the pyrotechnic varnish. 10. Process according to claim 1, characterized in that the amount of copolymer is between 50 and 60% by weight with respect to the total weight of the aqueous suspension based on said copolymer. 11. Process according to claim 1, characterized in that the copolymer-based aqueous suspension additionally comprises a surfactant chosen from the group consisting of anionic surfactants and poly(vinyl alcohol). 12. Process according to claim 1, characterized in that the copolymer-based aqueous suspension additionally comprises a plasticizer chosen from phthalates. 13. Process according to claim 1, characterized in that the aqueous adhesive additionally comprises a thickening agent based on modified cellulose. 14. Process according to claim 1, characterized in that the aqueous adhesive additionally comprises a metal powder or a metal salt which is opaque to X-rays. 15. Process according to claim 14, characterized in that the metal is chosen from the group consisting of tungsten, zirconium, bismuth and silver. 16. Electropyrotechnic initiator prepared according to claim 1 comprising a pyrotechnic varnish initiated by a resistive heating element, characterized in that the pyrotechnic varnish comprises:from 60 to 95% by weight of explosive substance,from 5 to 15% by weight of surfactant and of ethylene/vinyl acetate or vinyl acetate/ethylene acetate/ethylene copolymer,from 0 to 25% by weight of additives. 17. Electropyrotechnic initiator according to claim 16, characterized in that the additives comprise a thickening agent and an X-ray marker. 18. Electropyrotechnic initiator according to claim 17, characterized in that the thickening agent is based on modified cellulose. 19. Electropyrotechnic initiator according to claim 17, characterized in that the X-ray marker is a metal powder or a metal salt, the metal being chosen from the group consisting of tungsten, zirconium, bismuth and silver. 20. Electropyrotechnic initiator according to claim 16, characterized in that the explosive substance is chosen from the group consisting of prima ry explosives and oxidizer-reducer mixtures. 21. Electropyrotechnic initiator according to claim 20, characterized in that the resistive heating element is a cylindrical filament. 22. Electropyrotechnic initiator according to claim 20, characterized in that the resistive heating element is a bridge directly photoetched onto a printed circuit support. 23. Electropyrotechnic initiator according to claim 20, characterized in that the resistive heating element is a bridge, made of thin layers, which is surface mounted on a printed circuit support. 24. Electropyrotechnic initiator according to claim 20, characterized in that the explosive substances is a primary explosive. 25. Electropyrotechnic initiator according to claim 24, characterized in that the resistive heating element is a semiconductor bridge referred to as SCB.
이 특허에 인용된 특허 (5)
-
Duguet Jean-Rene (Orry La Ville FRX), Electro-pyrotechnical initiator.
-
Duguet Jean-Rene,FRX ; Martin Nicolas,FRX, Electropyrotechnic igniter with enhanced ignition reliability.
-
Fogle ; Jr. Homer W., Inflator for an inflatable vehicle occupant protection device.
-
Lenotre Michel Pierre Alphonse (Tarbes FR), Method of preparing priming explosives.
-
Chatley ; Jr. Glenn R., Power spot ignition droplet.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.